Miscellaneous alignments arc/cloud fixes

[cmdcolin]

• Stops coloring mate-missing features TLEN=0 as small arcs/pink boxes
• Add stroke outline to read cloud rectangle boxes
• Compact-ify read cloud display (remove some vertical y-axis space)
• Draw 'singletons' in read cloud display (paired feature not in view, on arc view this is e.g. a vertical line)

[codecov]

Codecov Report

Merging #3706 (0d93f44) into main (70eb9c7) will decrease coverage by 0.01%.
The diff coverage is 76.69%.

@@            Coverage Diff             @@
##             main    #3706      +/-   ##
==========================================
- Coverage   64.21%   64.21%   -0.01%     
==========================================
  Files         924      926       +2     
  Lines       29918    29947      +29     
  Branches     7252     7260       +8     
==========================================
+ Hits        19211    19229      +18     
- Misses      10526    10537      +11     
  Partials      181      181              

Impacted Files	Coverage Δ
...lugins/alignments/src/LinearPileupDisplay/model.ts	71.96% <ø> (ø)
...inearReadArcsDisplay/components/ReactComponent.tsx	100.00% <ø> (ø)
...nearReadCloudDisplay/components/ReactComponent.tsx	100.00% <ø> (ø)
...ns/alignments/src/LinearReadCloudDisplay/model.tsx	56.52% <0.00%> (-3.95%)	⬇️
...e/src/MultiDensityRenderer/MultiDensityRenderer.ts	0.00% <ø> (ø)
.../wiggle/src/MultiLineRenderer/MultiLineRenderer.ts	0.00% <ø> (ø)
...e/src/MultiRowLineRenderer/MultiRowLineRenderer.ts	0.00% <ø> (ø)
...c/MultiRowXYPlotRenderer/MultiRowXYPlotRenderer.ts	95.83% <ø> (ø)
...gle/src/MultiXYPlotRenderer/MultiXYPlotRenderer.ts	0.00% <ø> (ø)
plugins/wiggle/src/util.ts	70.53% <ø> (-1.50%)	⬇️
... and 8 more

... and 2 files with indirect coverage changes

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